Tofauti kati ya marekesbisho "Mapacha"

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* {{Cite journal|vauthors=Wenk RE, Houtz T, Brooks M, Chiafari FA | title=How frequent is heteropaternal superfecundation? |journal=Acta geneticae medicae et gemellologiae | year=1992 | volume=41 | issue=1 | pages=43–7 | pmid=1488855}}
* {{Cite journal |first1=Eloy |last1=Girela |last2=Lorente |first2=Jose A. |last3=Alvarez |first3=J. Carlos |last4=Rodrigo |first4=Maria D. |last5=Lorente |first5=Miguel |last6=Villanueva |first6=Enrique |display-authors=5 |journal=Fertility and Sterility |title=Indisputable double paternity in dizygous twins |year=1997 |volume=67 |issue=6 |pages=1159–61 |pmid=9176461 |doi=10.1016/S0015-0282(97)81456-2}}
* {{Cite journal |vauthors=Shinwell ES, Reichman B, Lerner-Geva L, Boyko V, Blickstein I |title="Masculinizing" effect on respiratory morbidity in girls from unlike-sex preterm twins: a possible transchorionic paracrine effect |journal=Pediatrics |volume=120 |issue=3 |pages=e447–53 |date=September 2007 |pmid=17766488 |doi=10.1542/peds.2006-3574 |url=http://pediatrics.aappublications.org/cgi/pmidlookup?view=long&pmid=17766488 |accessdate=2008-10-06 }}{{Dead link|date=August 2021 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{Cite journal|vauthors=Lummaa V, Pettay JE, Russell AF |title=Male twins reduce fitness of female co-twins in humans |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=104 |issue=26 |pages=10915–20 |date=June 2007 |pmid=17576931 |pmc=1904168 |doi=10.1073/pnas.0605875104 |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=17576931 |accessdate=2008-10-06}}
* {{Cite book|first=Elyse |last=Schein |author2=Paula Bernstein |title=Identical Strangers: A Memoir of Twins Separated and Reunited |url=https://archive.org/details/identicalstrange0000sche |publisher=Random House |location=New York |year=2007 |pages= |isbn=1-4000-6496-1 |oclc=123390922}}